A soft bump under the skin of a dog's chest may be a lipoma. It is one of the most common skin tumors in dogs and usually appears as a painless, movable subcutaneous mass. Lipomas are usually benign, but in rare cases they can become worse. It could also be a cyst, which is an enclosed space filled with fluid or gas that can result from infection, inflammation, or other causes. Cysts usually feel soft and undulating when touched.

If there is a soft bump under the skin of the dog's chest, don't be too nervous. First observe the changes in the soft bag. If abnormalities appear or persist, please seek veterinary help in time. With proper diagnosis and treatment, most soft bag problems can be properly resolved. At the same time, maintaining a balanced diet and moderate exercise for dogs can help improve their immunity and reduce the occurrence of diseases.